There are currently three medications approved for spinal muscular atrophy (SMA), but the use of these medications in combination has not been well described.

中文翻译：

---

Onasemnogene和risdiplam联合治疗1型脊髓性肌萎缩症

目前有三种药物被批准用于治疗脊髓性肌萎缩症 (SMA)，但尚未很好地描述这些药物联合使用的情况。